App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 684 · 40 questions

Developer's tip (In, work, out): Input → processing → output. Input: typing, tapping, a photo, your voice. Output: a result on screen, a sound, a buzz, a pop-up. In code, the processing line works out a new value from the inputs; show() is the output.

1. 1.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
2. 2.True or false: a beep sound is processing. (a) True (b) False
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 205; // typed by the user
   line 2: let friends = 5; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 4 (b) line 1 (c) line 2 (d) line 3
4. 4.Which of these is processing? (a) a result on screen (b) sorting the scores (c) a buzz (vibration) (d) typing your age
5. 5.⚙️ What number does this app show?
   let bill = 66; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.True or false: speaking a command is an input. (a) False (b) True
8. 8.Which of these is an output? (a) checking a password (b) working out a tip (c) speaking a command (d) a buzz (vibration)
9. 9.True or false: sorting the scores is an output. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) sorting the scores
12. 12.⚙️ What number does this app show?
    let bill = 92; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
15. 15.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 240; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 2 (c) line 1 (d) line 4
17. 17.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) a result on screen (d) a beep sound
18. 18.True or false: a pop-up message is an output. (a) False (b) True
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 3 (d) line 2
20. 20.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) taking a photo (d) a buzz (vibration)
21. 21.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 102; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 2 (c) line 1 (d) line 4
23. 23.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) tapping a button (d) working out a tip
24. 24.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) working out a tip
25. 25.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
28. 28.Which of these is an output? (a) taking a photo (b) checking a password (c) working out a tip (d) a result on screen
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 75; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 4 (c) line 1 (d) line 3
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) adding up a bill (d) a result on screen
31. 31.True or false: sorting the scores is an input. (a) False (b) True
32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
34. 34.True or false: a beep sound is an input. (a) True (b) False
35. 35.Which of these is an input? (a) a beep sound (b) adding up a bill (c) taking a photo (d) sorting the scores
36. 36.True or false: tapping a button is processing. (a) True (b) False
37. 37.True or false: tapping a button is an input. (a) True (b) False
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 30; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 2 (d) line 3
39. 39.⚙️ What number does this app show?
    let bill = 235; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);

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